Biodrivmedelsproduktion integrerat i sågverk: En energisystemsanalys
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The most commonly used fuels within transport in Sweden today are fossil fuels. Sweden has a national goal to have a fossil free vehicle fleet in 2030. To be able to reach the national goal by 2030 a major adjustment of the transportation sector has to be conducted. This project has investigated biofuel production integrated in sawmills. The integrations have been studied from an economic, resource and environmental perspective.Ethanol and methanol produced from woody biomass via enzymatic hydrolysis and gasification respectively are the biofuels studied in this project. The two biofuels has been studied in two separate case studies. The biofuel production has been integrated into two different sawmills, one that cooperates with nearby industries (cluster) and one that has no cooperation with other industries (stand-alone). Both case studies show that more wood chips than the amount of wood chips available at the studied sawmills are needed to cover the heat demand in each sawmill. The revenues and operating time are the parameters that affect the results most.The ethanol case study shows that an integrated ethanol plant can produce 20 and 17 MW ethanol in the cluster and the stand-alone sawmill, respectively. The efficiency of the cluster is higher than for the stand-alone plant because it produces excess electricity and heat which can be sold to a nearby district heating system. The payback time and internal rate of return for an investment in an ethanol plant is about 12 years and 5% for both integrations. The stand-alone plant has the higher net present value. In the methanol case study the plant in the cluster can produce 58 MW methanol and the stand-alone plant can produce 46 MW methanol. As for the ethanol case the efficiency of the cluster is higher than for the stand-alone plant because it produces excess heat which can be sold to a nearby district heating system. The payback time and internal rate of return for an investment in a methanol plant is about 8 years and 11% for both integrations. The plant in the cluster has the higher net present value. It is economically feasible in today’s society to produce biofuel in plants integrated in sawmills, with profit. For the investigated sawmills a production of biofuel is profitable for all four integrated plant configurations, regarding payback time, internal rate of return and net present value. It is more profitable to produce ethanol or methanol in a plant which is integrated with a sawmill compared to a plant of the same size which is not integrated.
Place, publisher, year, edition, pages
2015. , 95 p.
Teknik, Biodrivmedel, sågverk, integration, etanol, metanol
IdentifiersURN: urn:nbn:se:ltu:diva-42764Local ID: 0bccb104-8623-42ce-b4d5-5ecbf0f254f9OAI: oai:DiVA.org:ltu-42764DiVA: diva2:1015990
Subject / course
Student thesis, at least 30 credits
Sustainable Energy Engineering, master's level
Validerat; 20150622 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved